The problem would simply be find the LCD of the numbers 1-10 if only notes of one duration were allowed and you simply tied the correct number of them together to produce a note whose duration was 1 / nth of a beat. However, the procedure for splitting a note has been in musical notation for centuries: add a stem to a whole note, fill in a half note, add a(nother) flag to split quarters, eighths, etc. Also, triplets are supported so it won't be necessary to come up with an LCD of 2520.